With a budget of around Rs 20 lakh on-road, you could look at the VW Virtus GT Plus 1.5 with a manual gearbox or the Skoda Slavia Sportline 1.5 DSG (automatic). Both are equally fun to drive.
If you are open to the hatchback body style, you could even consider a Hyundai i20 N Line either with a manual or DCT (auto). Not only is the i20 fun-to-drive, but you'll also end up with tidy savings, as this hatchback is well within your budget.

